GHRS Instrument Science Report 051

"GHRS Relative Sensitivity Monitoring"

David R. Soderblom, Lisa E. Sherbert, Stephen J. Hulbert, Ronald L. 
Gilliland and Hashima Hasan

Abstract excerpted from the report:

GHRS observations of BD+28degrees 4211 since 13 Jan 1992 show that the
sensitivity of the GHRS is stable to within 3.6% or better and that the
variations seen are consistent with throughput variations due to focus
changes and minor centering errors. A plot of the sensitivity over 
this time is provided with indication of focus changes in the OTA.